Antonym: changeable, inconstant, mutable. Similar words: instant, instantly, consultant, instance, distant, for instance, assistant, substantial. Meaning: ['kɑnstənt /'kɒn-] 
n. 1. a quantity that does not vary 2. a number representing a quantity assumed to have a fixed value in a specified mathematical context. adj. 1. persistent in occurrence and unvarying in nature 2. continually recurring or continuing without interruption 3. steadfast in purpose or devotion or affection 4. uninterrupted in time and indefinitely long continuing.
n. 1. a quantity that does not vary 2. a number representing a quantity assumed to have a fixed value in a specified mathematical context. adj. 1. persistent in occurrence and unvarying in nature 2. continually recurring or continuing without interruption 3. steadfast in purpose or devotion or affection 4. uninterrupted in time and indefinitely long continuing. 
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271. These instruments combine constant resolution and high precision of frequency measurement with great photometric accuracy.
272. Although parents undoubtedly affect their children in positive, life-sustaining ways, they can also be the most vocal and constant editors.
273. The whole world is in constant motion. The earth moves, the clouds move, the waves move and we too must move. Move and reach to the destination of your choice. RVM 
274. Concerning non-violence: it is criminal to teach a man not to defend himself when he is the constant victim of brutal attacks. Malcolm X
275. There were the violent outbursts, way out of proportion to any wrong done,[sentencedict.com] and constant verbal abuse.
276. Most of these constant offenders started down the path of crime while still of school age.
277. Reyes tells the story, now with a smirk, of constant batterings by admissions officers because of the standardized tests.
278. Love is like the North Star. In a changing world, it's always constant. Gordon B. Hinckley
279. She has been in almost constant pain since her accident.
280. Honesty is an expensive virtue, and no one is really 100% honest. People are by nature half- honest and half- hypocritical, and they naturally choose to be hypocritical if doing so is beneficial to them. There is always a constant struggle between honesty and dishonesty, but nothing can replace honesty in a pleasant, healthy and happy life. Dr T.P.Chia
281. Constant rain, and when it's not raining it looks as if it's about to.
282. Out of a starting point in a constant featureless environment, life spontaneously diversified.
283. Constant complaint is the poorest sort of pay for all the comforts we enjoy. Benjamin Franklin
284. Constant mulling had left Father Vic afflicted with a wide array of nervous tics, small flinches and exasperated sighs.
285. Those whose husbands were away went in constant dread of advances made to them by Allied soldiers in the area.
286. The most splendid achievement of all is the constant striving to surpass yourself and to be worthy of your own approval. Denis Waitley
More similar words: instant, instantly, consultant, instance, distant, for instance, assistant, substantial, construct, substantially, constraint, constitute, construction, constitution, constructing, constitutional, non-stop, monster, stand, install, stand by, stand for, stance, stand up, stand out, important, reluctant, standard, CONS, demonstrate.